import { ContextManager, Event, Observable } from '@zcomponent/core';
import { Group } from '@zcomponent/three/lib/components/Group';
/**
 * The position of content placed in this group can be chosen by the user.
 *
 * @zcomponent
 * @zicon open_with
 * @zgroup AR
 * @ztag three/Object3D/Group/PlacementGroup
 * @zparents three/Object3D/Group/**
 */
export declare class WorldPlacementGroup extends Group {
    /** @zui */
    onVisible: Event<[]>;
    /** @zui */
    onPlaced: Event<[]>;
    /**
     * When `true` at runtime, the position of the contents of this component will be reset every frame to a point directly in front of the camera.
     *
     * @zui
     * @zdefault false
     * @zgroup WorldPlacementGroup
     * @zgrouppriority 20
     */
    isPlacing: Observable<boolean, never>;
    /**
     * By default, with this parameter `false` the scale of the contents of this component is that of the parent component. If set to `true`, this component will adjust the scale based on the height of the camera above the origin.
     *
     * @zui
     * @zdefault false
     * @zgroup WorldPlacementGroup
     * @zgrouppriority 20
     */
    normalizeScale: Observable<boolean, never>;
    /**
     * While placing, the group will be rotated so the positive `z` axis points towards the camera.
     *
     * @zui
     * @zdefault true
     * @zgroup WorldPlacementGroup
     * @zgrouppriority 20
     */
    faceCamera: Observable<boolean, never>;
    /**
     * A layer clip that will be played when the component is in placement mode (i.e. `isPlacing` is set to `true`).
     *
     * @zui
     * @zgroup Animation
     * @zgrouppriority 10
     * @zdefault false
     * @zvalues layerclipids
     */
    placingLayerClip: Observable<string | undefined, never>;
    /**
     * A layer clip that will be played when the component is not in placement mode (i.e. `isPlacing` is set to `false`).
     *
     * @zui
     * @zgroup Animation
     * @zgrouppriority 10
     * @zdefault false
     * @zvalues layerclipids
     */
    notPlacingLayerClip: Observable<string | undefined, never>;
    private _innerGroup;
    constructor(contextManager: ContextManager, constructorProps: {});
    private _groundPlaneIntersection;
    private _frame;
}